export const _circle = ({
    o, r
}) => {
    let [cx, cy] = o

    //非数值单位计算，如当宽度像100%则移除 
    if (isNaN(cx - cy)) return;
    var path = 'M' + (cx - r) + ' ' + cy + 'a' + r + ' ' + r + ' 0 1 0 ' + 2 * r + ' 0' + 'a' + r + ' ' + r + ' 0 1 0 ' + (-2 * r) + ' 0' + 'z';
    return path;
}